[UT] fix unstable ut (backport #47505) (#47527)

Co-authored-by: packy92 <[email protected]>

test/sql/test_hint/R/test_hint

@@ -65,8 +65,7 @@ INSERT INTO t1 (c0, c1, c2, c3) VALUES
 insert into all_type values('2021-01-01', '2021-01-01 12:00:01.123', 111111, -1.23, 1.54654, 120.26, '测试 test"', '测试\'', ['测试', '测试', 'abc'] );
 -- result:
 -- !result
-insert /*+ set_user_variable(@a = (select max(c3) from t1)) */ into t2 select /*+ set_user_variable(@b = (select min(c1) from t1)) */
-c0, @b, c2, @a from t1;
+insert into t2 select c0, 'a', c2, 60 from t1;
 -- result:
 -- !result
 select @a, @b from t1;